javascript - React checkbutton onChange 事件返回合成事件

Question

我有一个 React 复选框组件。我试图在每次点击时更改状态并根据之前的状态运行一个函数。在 React 上，每次单击按钮时，我都试图将事件返回到 index.js 中的 console.log 函数。

但它总是返回合成事件，我无法达到 event.target.value。

我的 index.js 和 props 是;

ReactDOM.render(<ReactCheckBox
    isChecked={false}
    textCheck="Checked"
    textUncheck="Checked"
    onCheckedRun={event => console.log(event.target)}
    onUncheckedRun={event => console.log(event.target)}
    buttonPosition="right"
/>, document.getElementById('myCheckBox'))

我的 ReactCheckBox 组件是；

import React, { Component } from 'react'

class ReactCheckBox extends Component {
    constructor(props) {
        super(props)
        this.state = {
            checked: ""
        }
        this.onChangeHandler = this.onChangeHandler.bind(this)

    }
    componentDidMount() {
        this.setState({
            checked: this.props.isChecked
        })
    }

    onChangeHandler(event) {
        this.setState(function (previousState, props) {
            console.log('State: ',this.state.checked)
            if (previousState.checked === true) {
                props.onCheckedRun(event)
            } else {
                props.onUncheckedRun(event)
            }
            return {
                checked: !this.state.checked
            }
        }
        )
    }

    render() {
        if (this.props.disabled === "true") {
            return (
                <div>
                    <div className="form-check">
                        <label className="form-check-label">
                            <div className="uniform-checker border-primary-600 text-primary-800">
                                <span className="checked">
                                    <input onChange={this.onChangeHandler} type="checkbox" className="form-check-input-styled-primary" defaultChecked={this.state.checked ? 'checked' : 'unchecked'} data-fouc="" disabled></input>
                                </span>
                            </div>
                            Primary checkbox
                        </label>
                    </div>
                </div>

            )
        }
        else {
            return (
                <div>
                    <div>
                        <div className="form-check">
                            <label className="form-check-label">
                                <div className="uniform-checker border-primary-600 text-primary-800">
                                    <span className={this.state.checked ? 'checked' : 'unchecked'}>
                                        <input onChange={this.onChangeHandler} type="checkbox" className="form-check-input-styled-primary" defaultChecked={this.state.checked ? 'checked' : 'unchecked'} ></input>
                                    </span>
                                </div>
                                Primary checkbox
                            </label>
                        </div>
                    </div>
                </div>
            )
        }
    }
}

export default ReactCheckBox

有人遇到过同样的问题吗？我怎样才能克服合成事件并获得真实事件，以便实现它的值(value)？

更新

综合错误事件

index.js:1375 Warning: This synthetic event is reused for performance reasons. If you're seeing this, you're accessing the method currentTarget on a released/nullified synthetic event. This is a no-op function. If you must keep the original synthetic event around, use event.persist(). See fb.me/react-event-pooling for more information.

Answer 1

而不是 event.target尝试 event.currentTarget获取特定的目标元素。

• event.currentTarget docs
• a nice post about event.target vs event.currentTarget

更新:关于您的更新和错误，您可以尝试这样做:而不是使用 <input onChange={this.onChangeHandler}>这样做:

<input onChange={(e)=>{this.onChangeHandler(e)}}>

或者只是:

<input onChange={(e)=>{onchangeHandler(e)}}>

所以整行是:

<input onChange={()=>{this.onChangeHandler(e)}} type="checkbox" className="form-check-input-styled-primary" defaultChecked={this.state.checked ? 'checked' : 'unchecked'} ></input>